Today I Learned

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Does CoffeeScript has a ternary operator?

Javascript has a ternary operator condition ? expr1 : expr2 like:

var x = true;
x ? 'yes' : 'no'
//=> "yes"
x = false;
x ? 'yes' : 'no'
//=> "no"

What about CoffeeScript?

#is-it-ternary.coffee
x ? 'yes' : 'no'

will be compiled to the following:

//is-it-ternary.js
if (typeof x !== 'undefined' && x !== null) {
  x;
} else {
  ({ 'yes': 'no' });
}

Why? Because of The Existential Operator

So there is no ternary operator on CoffeeScript. The best you can do is to have an one-line if-else statement:

if x then 'yes' else 'no'

h/t @mwoods79